<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .d1{
                width:400px;
                height: 400px;
                background:yellowgreen;
                border-radius:200px ;
            }
            .d2{
                width:400px;
                height: 200px;
                background:pink;
                border-radius: 0px 0px 200px 200px;
            }
            .d3{
                width:200px;
                height: 400px;
                background:yellow;
                border-radius: 0px 200px 200px 0px;
            }
        </style>
    </head>
    <body>
        <div class="d1"></div>
        <div class="d2"></div>
        <div class="d3"></div>
    </body>
</html>